package com.lagou.dao.impl;

import com.lagou.dao.CourseContentDao;
import com.lagou.pojo.Course;
import com.lagou.pojo.Course_Lesson;
import com.lagou.pojo.Course_Section;
import com.lagou.utils.DateUtils;
import com.lagou.utils.DruidUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import java.sql.SQLException;
import java.util.List;

/**
 * @description: 课程内容DAO层实现类
 * @author: zhuxiang
 * @create: 2020-07-28 14:01
 **/
public class CourseContentDaoImpl implements CourseContentDao {

    //根据课程ID查询课程相关信息
    @Override
    public List<Course_Section> findSectionAndLessonByCourseId(int courseId) {

        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql = "SELECT \n" +
                    "id,\n" +
                    "course_id,\n" +
                    "section_name,\n" +
                    "description,\n" +
                    "order_num,\n" +
                    "STATUS\n" +
                    "FROM course_section WHERE course_id = ?";

            //3.执行查询
            List<Course_Section> sectionList = qr.query(sql, new BeanListHandler<Course_Section>(Course_Section.class), courseId);

            for (Course_Section section : sectionList){

                //调用方法 获取章节对应的课时
                List<Course_Lesson> lessonList = findLessonBySectionId(section.getId());
                //将课时数据封装到 章节对象
                section.setLessonList(lessonList);
            }
            return sectionList;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //根据章节ID 查询章节相关的课时信息
    @Override
    public List<Course_Lesson> findLessonBySectionId(int sectionId) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql =  "SELECT \n" +
                    "id,\n" +
                    "course_id,\n" +
                    "section_id,\n" +
                    "theme,\n" +
                    "duration,\n" +
                    "is_free,\n" +
                    "order_num,\n" +
                    "STATUS\n" +
                    "FROM course_lesson WHERE section_id = ?";

            List<Course_Lesson> lessonList = qr.query(sql, new BeanListHandler<Course_Lesson>(Course_Lesson.class), sectionId);
            return lessonList;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //根据课程ID 回显课程信息
    @Override
    public Course findCourseByCourseId(int courseId) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql =  "SELECT id,course_name FROM course WHERE id = ?";
            Course course = qr.query(sql, new BeanHandler<Course>(Course.class), courseId);
            return course;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //保存章节信息
    @Override
    public int saveSection(Course_Section section) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "INSERT INTO course_section(course_id," +
                    "section_name,description,order_num," +
                    "STATUS,create_time,update_time)" +
                    "VALUES(?,?,?,?,?,?,?);";
            Object[] param = {section.getCourse_id(),
                    section.getSection_name(),section.getDescription(),
                    section.getOrder_num(),section.getStatus(),
                    section.getCreate_time(),section.getUpdate_time()};

            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    @Override
    public int updateSection(Course_Section section) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "UPDATE course_section SET " +
                    "section_name = ?," +
                    "description = ?," +
                    "order_num = ?," +
                    "update_time = ? WHERE id = ?;";

            Object[] param = {section.getSection_name(),
                    section.getDescription(),
                    section.getOrder_num(),
                    section.getUpdate_time(),
                    section.getId()};
            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改章节状态
    @Override
    public int updateSectionStatus(int id, int status) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "UPDATE course_section SET STATUS = ?,update_time = ? WHERE id = ?";

            Object[] param = {status , DateUtils.getDateFormart(),id};

            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //保存课时信息
    @Override
    public int saveLesson(Course_Lesson lesson) {

        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql = "INSERT INTO course_lesson" +
                    "(course_id,section_id," +
                    "theme,duration,is_free," +
                    "order_num,create_time," +
                    "update_time) VALUE(?,?,?,?,?,?,?,?)";

            Object[] param = {lesson.getCourse_id(),lesson.getSection_id(),
                    lesson.getTheme(), lesson.getDuration(),
                    lesson.getIs_free(),lesson.getOrder_num(),
                    lesson.getCreate_time(),lesson.getUpdate_time()};

            //3.执行SQL
            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改课时信息
    @Override
    public int updateLesson(Course_Lesson lesson) {

        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql = "UPDATE course_lesson SET " +
                    "course_id = ?,section_id = ?,theme = ?," +
                    "duration = ?,is_free = ?," +
                    "order_num = ?,update_time = ? " +
                    "WHERE id = ?";

            Object[] param = {lesson.getCourse_id(),lesson.getSection_id(),
                    lesson.getTheme(),lesson.getDuration(),
                    lesson.getIs_free(),lesson.getOrder_num(),
                    lesson.getUpdate_time(),lesson.getId()};

            //3.执行SQL
            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }
}
